VY 3956 then BA 551 at Fiumicino
Bilbao → Rome → London Heathrow
Timetable, Rome time
13:20VY 3956 from Bilbao at the gate
12:15BA 551 to London Heathrow leaves the gate
22 h 55 apart on the timetable, overnight
BA 551 leaves 22 h 55 after VY 3956 arrives on the timetable: more than half a day, so not a connection we count.